Regenerating icons each time is annoying and slow.

This is the default framework folder structure.
Gives consistency with other CRA apps like Headlamp.

Whilst renaming, we move components in common/ and layout/ into their
own folder. So all the files related to them can be all together.

Themes should work as before.
All the theme selection features are not completely integrated
yet, but it is enough to use the themes within storybooks.

from Headlamp.

The Card.stories.tsx is minimal and unfinished because storyshots
requires one test to be there for the test to pass.

- Named files after component (ChannelItem.tsx not Item.tsx)
- Fixed some types to match app data
- Fixed some other type issues found

This is because different systems have different default locales
and different timezones - which makes testing more difficult.

Moved date/time formatting functions out of helpers into
src/i18n/dateTime.

The cross-env package is for cross platform setting of env vars.

- Removed __tests__/Activity (covered by storyshots)
- Named files after component (ActivityItem.tsx not Item.tsx)
- Fixed some types to match app data
- Fixed some other type issues found
- Added id to Activity API response
- Fixed issue with key using number instead of unique id
- Material UI generated IDs are not stable, mock for storyshots
- Used toLocaleString to make date locale related tests happy

- Removed __tests__/Applications(covered by storyshots)
- Named files after component (ApplicationItem.tsx not Item.tsx)
- Fixed some types to match app data
- Fixed some other type issues found
- Made ApplicationItemGroupItem use APIContext so stories can mock API

- Named files after component (GroupItem.tsx not Item.tsx)
- Separated some components into their own files

backend:
- version_breakdown was returning null instead of [] when empty

The coverage percentages in package.json that the testing needs to
meet are the current levels.